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SDB is a persistence layer for use with Apache Jena that uses an SQL database to store triples/quads.

There is a newer version: 3.17.0

/*
 * Licensed to the Apache Software Foundation (ASF) under one
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 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
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 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.jena.sdb.layout2;

/** The state of a variable as reocorde by the variable tracking code  */
public enum VarState
{
    UNBOUND,        // The variable is definitely not set 
    BOUND,          // The varibale is definitely set
    MAYBE_BOUND     // The variable may or may not be set. 
}